Failure of levonorgestrel tablets may result in symptoms of early pregnancy, such as menopause, early pregnancy reaction, frequent urination and breast changes. 1. Menopause: after using levonorgestrel tablets for emergency contraception, if there are symptoms of menopause, it suggests that contraception has failed and you may be pregnant, and you can have an early pregnancy test to confirm the diagnosis. 2. Early pregnancy reaction: after taking levonorgestrel tablets, the symptoms of menopause, and in the case of nausea, vomiting, drowsiness, loss of appetite and other symptoms after 6 weeks of menopause, it may suggest that contraception has failed and pregnancy has occurred. 3. Frequent urination: the uterus will gradually increase in size in the early stage of pregnancy and press the bladder, resulting in frequent urination. 4. Breast changes: taking levonorgestrel contraceptive failure, successful pregnancy due to the influence of estrogen and progesterone, there will be breast swelling and pain, areola enlargement, areola pigmentation and other symptoms. After taking levonorgestrel tablets, early or delayed menstruation may occur, if the menstrual period is more than 10 days, it is recommended to consult a doctor for examination to determine whether pregnancy.